Medium
shutil.unpack_archive() doesn't check for Windows absolute paths in ZIPs
Type: advisorySources: OSV
If `shutil.unpack_archive()` is given a ZIP archive with an absolute Windows path containing a drive (`C:\\...`) then the archive will be extracted outside the target directory which is different than other operating systems. Only Windows is affected by this vulnerability.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2026-3087
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 3 Nov 2026, 07:10 UTC · Revision 1
Source evidence
shutil.unpack_archive() doesn't check for Windows absolute paths in ZIPs
core-osv · Original sourcePublished 27 Apr 2026, 20:46 UTC
If `shutil.unpack_archive()` is given a ZIP archive with an absolute Windows path containing a drive (`C:\\...`) then the archive will be extracted outside the target directory which is different than other operating systems. Only Windows is affected by this vulnerability.
osv:CVE-2026-3087
Complete source record
{
"id": "73839ace94b24e8c8727b9703fcd656a32b671f09327c9807bd4be13f7350ace",
"url": "https://osv.dev/vulnerability/CVE-2026-3087",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "shutil.unpack_archive() doesn't check for Windows absolute paths in ZIPs",
"summary": "If `shutil.unpack_archive()` is given a ZIP archive with an absolute Windows path containing a drive (`C:\\\\...`) then the archive will be extracted outside the target directory which is different than other operating systems. Only Windows is affected by this vulnerability.",
"evidence": "osv:CVE-2026-3087",
"products": [],
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"modified": "2026-10-28T02:30:27.069219707Z",
"provider": "osv",
"references": [
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"https://mail.python.org/archives/list/security-announce@python.org/thread/X6FXE5C6KDKOVNX3EC3DWD5RUPFWOZA4/",
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"source_id": "core-osv",
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"published_at": "2026-04-27T20:46:43.201+00:00"
}